Los Zetas spend all drug profits fighting off the Cártel del Golfo?

Here's a drug war statistic for you, courtesy of Mexico's Reforma newspaper: Los Zetas earn $350 million annually by importing 40 tonnes (80,000 pounds) of cocaine a year into the United States alone, but since 2010 have had to spend practically all that money trying to fight off their former employers, the Gulf Cartel.